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A Three-Stage Process of CO-Selective Methanation Based on Its Reaction Characteristics: Achieving a High Gas Hourly Space Velocity
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DOI：10.3390/hydrogen7010039.png)
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Abstract
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CO-selective methanation (CO-SMET) is an important technology for CO deep removal from reforming hydrogen. We previously proposed a three-stage CO-SMET with a decreasing temperature profile based on critical CO concentration. In this study, focusing on the sharp decline in each stage's CO inlet concentration, we further proposed and validated a three-stage CO-SMET process characterized by an increasing space velocity profile, combined with a decreasing temperature profile. Compared to operating all stages at an identical space velocity of 9000 h-1, increasing the space velocities of the second and third stages to 27,000 h-1-thereby raising the overall space velocity from 3000 h-1 to 5400 h-1-only modestly increased the CO outlet concentration from 2.1 ppm to 6.5 ppm, while slightly improving the CO selectivity from 75.3% to 76.3%. These findings offer valuable insights into CO-SMET design that simultaneously achieve high CO-removal depth, high CO selectivity, and high space velocity.
Keywords:
CO-selective methanation
three-stage
space velocity
critical CO concentration
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3
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